As the anti-vaccine rhetoric has increased on the Internet, so too have scientifically sound assessments of their concerns. If confronted with concerns that are novel, these resources may be of interest.
Science-based medicine — This online blog has several contributors and regularly addresses vaccine safety-related concerns. A review of recent posts includes:
Every Child By Two (ECBT) — In addition to their extremely successful Vaccinate Your Baby and newer Vaccinate Your Family campaigns, Every Child By Two provides information and resources on their original website, including expert commentaries: